Some of them you can't walk on. At least that is what they say. I have
been told that the membrane company will void the warranty if you walk on
the stone. I would do whatever the landlord specifies.
-----Original Message-----
From: Adam Moffett
Sent: Thursday, January 29, 2015 1:50 PM
To: [email protected]
Subject: Re: [AFMUG] Nonpen on River Rock Roof
I always just put them on top of the rock in the past. Never had a
problem (that I'm aware of). The nonpen sitting on a rubber pad puts
fewer PSI on the roof than a person walking....so theoretically if you
can walk on it you can put a non-pen on it.
One landlord required me to sweep away the rock first. Same landlord
required a sacrificial piece of EPDM roofing in addition to the rubber
pad that we always used....so IMO he was a little paranoid.
Thoughts on pros/cons. When putting a Non-Pen on a roof with river rock,
(if that's what it's called, 1/2"-1" diameter stones, no tar) do you clear
the rock and put the non-pen mats directly on the roof, or put the mats
and non-pen on top of the rock?
